Laser & Photonics Reviews
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2025
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IF 10
Wei Liao,Kai Han,Yuzhen Wang,Zhiguo Xia
X-ray imaging based on scintillators with visible-light emission primarily reveals structural information, but the integrated detection of complex targets, especially biological systems, remains challenging. Here, a dual-mode collaborative imaging strategy is proposed based on the design of perovskite-type halide scintillators (Cs 2 HfCl 6 :Mo 4+ ), which present efficient near-infrared (NIR) emission above 900 nm upon the excitations of 808 nm laser and X-ray sources. Dual-mode indirect imaging with simple excitation source switching has been performed to visualize bone and blood vessels in biological targets. The light yield and detection limit are estimated to be 44500 Ph MeV −1 and 87.4 nGy s −1 , respectively, and a dual-mode imaging screen with spatial resolution of 14 lp mm −1 for NIR imaging and 12 lp mm −1 for X-ray imaging is successfully obtained. This work may stimulate research into the NIR scintillators for the development of multi-mode imaging with mitigating light crosstalk.
研究领域:
材料科学
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医学影像
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光学工程
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DOI
高影响因子
INORGANIC CHEMISTRY
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2021
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IF 5.165
Ruxin Liu,Wenjun Zhang,Wenjing Liu,Guojing Li
Lead-free perovskites have been widely studied due to their environmental friendliness and high stability. In this study, Bi3+-doped Cs2HfCl6 has been synthesized at room temperature. Different from the emission of the Cs2HfCl6 host (452 nm), Bi3+:Cs2HfCl6 can produce a bright blue emission at an excitation wavelength of 350 nm, which is derived from the 3P1 → 1S0 transition of Bi ions and accompanied by the properties of self-trapped excitons. Moreover, 7%Bi3+:Cs2HfCl6 shows excellent stability with the photoluminescence quantum yield reaching up to 69.08%. Meanwhile, a light-emitting diode that is close to pure white light has been fabricated by using 7%Bi3+:Cs2HfCl6, which has a high color rendering index of 92.5. These results show that Bi3+:Cs2HfCl6 would be a potential candidate in the field of inorganic luminescent materials.
研究领域:
材料科学
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光电
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光子学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Jialiang Jiang,Jinju Zheng,Hui Fu,Hao Zhang,Deliu Ou,Qiaochu Chen,Kai Wang,Sheng Cao,Jialong Zhao,Zhentao Du,Weiyou Yang
Vacancy-ordered double perovskites (DPs) are promising candidates for modern white light-emitting-diodes (WLEDs) due to their low toxicity and unique optical properties. However, the grand challenge is that DPs synthesized at room temperature (RT) typically have a low photoluminescence quantum yield (PLQY), most of which reported below 51 %, making them impractical for applications. Here, we present a facile strategy for the mass production of Bi 3+ and Te 4+ co-doped Cs 2 HfCl 6 (CHC) DPs at RT, to realize single-component dual-band emission with a high color rendering index. It is witnessed that the rationally designed ligand [Hmim]Cl facilitates a strong chemical interaction between the ligand and DPs. This interaction allows [Hmim]Cl to coordinate with undercoordinated Hf 4+ ions and provide excess chloride ions to the surface of the DPs. Consequently, it effectively controls the crystallization of DPs, protects them against moisture, reduces surface defects, and increases the migration barrier of halogen ions. As a result, the DPs exhibit excellent overall performance with robust photostability and a superior PLQY of 96.4 %, which is ∼ 2 times the highest reported value for similar DPs synthesized at RT. Current work presents a potential pathway for the mass production of high-quality DPs under mild conditions, leading to the development of signal-component WLEDs.
研究领域:
材料科学
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光电技术
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纳米技术
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DOI
高影响因子
Laser & Photonics Reviews
·
2021
·Vol. 16
·期 2
·2100439
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IF 13.138
Siping Liu,Bin Yang,Junsheng Chen,Daoyuan Zheng,Zhe Tang,Weiqiao Deng,Keli Han
Vacancy-ordered perovskite nanocrystals (NCs) have recently attracted much interest owing to their unique structure and optical properties; however, regulating self-trapped excitons (STEs) in vacancy-ordered perovskite NCs to exhibit tunable multicolor emission is still challenging because of the highly localized charge distribution and strong carrier-phonon coupling. Herein, the first colloidal synthesis of lead-free vacancy-ordered Cs 2 HfCl 6 perovskite NCs by a hot-injection method using hafnium acetylacetonate as metal precursors is reported. The passivation strategy of sub-bandgap trap states inside Cs 2 HfCl 6 NCs is proposed by doping Sb 3+ . X-ray photoelectron spectroscopy (XPS) measurements verify that the passivation of sub-bandgap trap states may be attributed to the enhanced chemical interaction between the Hf 4+ cations and Cl – anions. Simultaneously, the introduction of Sb 3+ ions yields a bright orange emission. Employing lanthanide acetylacetonate compounds, four lanthanide ions including Pr 3+ , Eu 3+ , Tb 3+ , and Ho 3+ are doped into the Cs 2 HfCl 6 NCs, which achieves tunable multicolor emissions (from blue to green to pink) through the energy transfer from STEs to lanthanide ions. This investigation not only develops a novel vacancy-ordered perovskite NCs, but also provides effective strategies for tuning the optical properties of lead-free vacancy-ordered perovskite NCs.
研究领域:
材料科学
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光学
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DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 12
·期 6
·2053-2062
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IF 6.4
Zixuan Huang,Jinju Zheng,Hui Fu,Jialiang Jiang,Zilong Li,Chunhong Gu,Zhentao Du,Yang Yang,Weiyou Yang,Jialong Zhao
Non-toxic lead-free vacancy-ordered double perovskites (DPs) are attracting more and more wide interest, thanks to their environment- and eco-friendly nature with exciting applications in modern optoelectronic devices. However, most intrinsic vacancy-ordered DPs exhibit a simple luminescence mode with poor photoluminescence (PL) quantum yield (QY). Herein, we report the exploration of ns2-type ion (Bi3+ and Sb3+) co-doped vacancy-ordered DP Cs2HfCl6 microcrystals (MCs) by a room-temperature precipitation method. Different to single-dopant analogues, the co-doped DPs deliver dual emission bands, which are sensitive to the excitation wavelength and tunable across the full-color region. It is verified that the emission band peaked at 460 nm should have originated from the triplet self-trapped excitons (STEs) of Bi3+ with a lifetime of hundreds of nanoseconds, while that peaked at 590 nm should be ascribed to the microsecond-timescale STEs of Sb3+, respectively. Accordingly, based on these co-doped DPs, high-performance devices such as multi-color anti-counterfeiting and single-component white light emitting diodes (WLEDs) (CIE = (0.344, 0.337), CRI = 84) have been achieved. Moreover, the as-assembled optical temperature sensor exhibits relative sensitivity (SR) and absolute sensitivity (SA) of 1.2% K−1 and 0.013 K−1, respectively, representing their bright future toward multifunctional optoelectronic applications.
研究领域:
材料科学
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光学工程
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电子工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Yanqing Zu,Run Gan,Lixia Jing,Bing Yang,Binglin Zeng,Liru Yuan,Peitao Liu,Xiaodong Li,Ailing Feng,Lei Zhou
Lead-free vacancy-ordered double perovskites are promising scintillator candidates for X-ray imaging due to their excellent photoluminescence and low afterglow. However, the defect-related nonradiative recombination will decrease their photoluminescence intensity as well as scintillation performance. In this work, a facile room-temperature recrystallization approach was used to prepare high-quality Cs 2 HfCl 6 :1% Te perovskites microcrystals with suppressed defects via in situ ligand passivation with cationic quaternary ammonium surfactants. By tuning the chain length of ligands, dodecyltrimethylammonium chloride (DTAC) passivated Cs 2 HfCl 6 :1% Te possesses a high photoluminescence quantum yield (PLQY) up to 73.87%, which is higher than that of didodecyldimethylammonium chloride (DDAC) passivated Cs 2 HfCl 6 :1% Te. The improved performances of perovskites were further clarified by density functional theory (DFT) computations, which reveal that a larger binding energy for DTAC (−2.069 eV) exceeds that of DDAC (−1.891 eV). The Cs 2 HfCl 6 :1% Te (DTAC) exhibits a high spatial resolution (10 lp mm −1 ) and notable light yield (19,693 photons MeV −1 ). This study provides an effective strategy for defect suppression in perovskite scintillators, facilitating their use in high-resolution X-ray imaging.
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高影响因子
Advanced Powder Materials
·
2025
·
IF 24.9
Rujun Yang,Kunjie Song,Yuantian Zheng,Chenhan Zhan,Yajing Wang,Cunjian Lin,Tianliang Zhou,Yixi Zhuang,Rong-Jun Xie
Persistent Luminescence (PersL) materials, which use traps to store energy and emit photons over a long period, have found important applications in the fields of optical information storage, security labeling, and biological imaging. The trap depth is a crucial factor determining the performance of these materials; however, achieving the desired trap depth with high precision remains a great challenge. Here, we provide double perovskite phosphors (Cs 2 SnCl 6 -Cs 2 ZrCl 6 -Cs 2 HfCl 6 series) with highly compatible crystal structures, enabling continuous and precise tuning of trap depth over an ultra-wide range of 0.11 to 1.25 eV. By incorporating W 4+ as the luminescent centers, these phosphors exhibit outstanding near-infrared (NIR) PersL performance at approximately 900 nm and a lasting emission duration exceeding 10 h. The underlying mechanism of PersL is elucidated, and the wide-range tunability of trap depth is attributed to the universal applicability of band-gap engineering in the entire material system. Furthermore, we demonstrate the practical application of these materials by designing a flexible detector plate for X-ray imaging. The detector plate exhibits a storage time of more than 1 week, a detection limit of 0.83 μGy air ·s -1 in the near-infrared region, and real-time and delay-time imaging resolutions of 14.2 lp·mm -1 and 2.5 lp·mm -1 , respectively. These attributes demonstrate strong potential for X-ray luminescence extension imaging.
研究领域:
材料科学
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光学材料
·
固体物理
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纳米技术
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生物医学成像
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X射线探测
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）